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I'm putting in Royal Purple Synchromax. I asked around and was told manual tranny's use dex\merc 3. I don't care as much as what it used originally back in 93, but whats the best I can get that will do the best job in the gear box? Cost is NOT an issue. Any "know it all" out there wanna give this one a shot? What did it use originally? I know the motor came with Valvoline sae30...

Manual trans takes 75W90 gear fluid. I've used synthetic valvoline in mine.

There are lots of options on the market, bang for the buck use GM syncromesh, royal purple tends to work well in some applications but not others, but for our trans it depends more on where you live and the climate you are in most of the time, at hotter temps use a full synthetic 75w90 colder temps use a thinner oil. I am using redline mtl and it works pertty good. Its more a pick your preference thing when it comes to that stuff.

I use ATF in my cold a-- climate.

I use Royal Purple 75w90 with a little bit of lucas mixed in.

Ryan wrote:I use ATF in my cold a-- climate.

Hmm, ATF isn't gear oil, it's hydraulic oil...the exact same stuff that's in your power steering.

The blood and souls of my enemies...

Yup. Check the manual though, it suggests it for the cold days. My reputable Mazda tech suggests it too.

bleh its just transmission oil. If you are not pushing over 200 hp at the wheen you shouldnt have to worry about it.

I use 75w90 gear oil.
The blood of my enemies I save it for breakfast.

Inodoro Pereyra wrote:I use 75w90 gear oil.
The blood of my enemies I save it for breakfast.

You're doing it wrong...the heart and liver are for breakfast, with candles rendered from the fat >_>

I have run both ATF royal purp, MTX royal purp and also MTX amsoil extreme gear. Out of all 3 I would probably recommend the ATF if you live in a colder climate as it really does make the shifts alot easier.

The royal purp MTF and the ams extreme gear are Ok, but I would probably buy the amsoil syn syncromesh MTF if I did it again.

The GM syncromesh is a good bang for the buck tho as Newfie_Dan said.

Hmm, didn't know you can use ATF fluid. I do understand why, damn on those extremely cold days it's hard to shift.

GM synchromesh is taking 260 w-horse and w-tq just fine.

I buy cheap s--- stuff 80w-90 and change it every summer. 5$ a bottle.

changing it more often is better than the best gear oil. I`ve heard all my life that gear oil is gear oil

how about if you finiky,

GEAR OIL lol + lucas oil stabalizer.